public class Rect extends Shape {
    private double length;
    private double width;

    public Rect(double length, double width) {
        this.length = length;
        this.width = width;
    }
    @Override
    public void draw(){
        System.out.println("矩形:length="+length+"width="+width);
    }

    @Override
    public void calcArea() {
        area = length*width;
    }


}
